I wouldn't fret for anything right now. It looks to me that you have sativa dominant strains, and it takes a while for some phenotypes to develop stalked trichomes (frostiness), and sativas in general have fewer to start with anyways. Look again at that Maui Waui, your plants have an equal number of trichomes, the maginification is just greater in my photos.
Wait a couple of weeks. You have very well developed colas and no sign of disease. I think you will be happy.
Wait a couple of weeks. You have very well developed colas and no sign of disease. I think you will be happy.